Liquid crystal display module and liquid crystal display device having the same

ABSTRACT

A liquid crystal display module includes a bottom chassis comprising a lower surface including at least one fastening hole disposed along a first direction; a printed circuit board comprising a first surface supported by the lower surface of the bottom chassis, a second surface opposite to the first surface, and at least one opening hole corresponding to the at least one fastening hole of the bottom chassis; a plurality of light emitting diodes mounted on the second surface of the printed circuit board; and at least one fastening member comprising a head part inserted into the at least one opening hole of the printed circuit board so as not to be protruded outwardly from the second surface of the printed circuit board, and a fastening part disposed in and affixed to the at least one fastening hole.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation application of U.S. patent application Ser. No.13/272,551, filed on Oct. 13, 2011, which claims the benefit of KoreanPatent Application No. 2010-0099779, filed on Oct. 13, 2010 in theKorean Intellectual Property Office, the disclosure of which isincorporated in its entirety herein by reference.

BACKGROUND

1. Field

Exemplary embodiments relate to a liquid crystal display module having astructure in which a printed circuit board is connected to a bottomchassis, and a liquid crystal display device having the same.

2. Description of the Related Art

In general, a liquid crystal display (LCD) device displays an imageusing electrical and optical characteristics of liquid crystals. The LCDdevice has a thin thickness, a light weight and low power consumptionand is operated at low drive voltage, as compared with other displaydevices, and thus has been widely used in the overall industries.

The LCD device includes a liquid crystal display panel in which liquidcrystal molecules are injected into a gap between two transparentsubstrates and voltage is applied to liquid crystal molecules so as tochange orientation of the liquid crystal modules to change lighttransmittance of the liquid crystal molecules and thus to opticallydisplay an image, and a liquid crystal display module to supply light tothe liquid crystal display panel.

Recently, an edge type liquid crystal display module using lightemitting diodes as a light source unit is mainly used so as to achieveslimness of the LCD device.

The edge type liquid crystal display module is provided with a printedcircuit board, on which a plurality of light emitting diodes is mounted.The light emitting diodes are provided on the side surface of the liquidcrystal display module, which guides light generated by the lightemitting diodes to the front surface of the liquid crystal displaymodule through a light guide plate, and then supplies the light to theliquid crystal display panel.

Such a liquid crystal display module is manufactured through a processof fixing the light source unit. In general, the printed circuit boardof the light source unit is assembled with a metal structure having an Lshape or other shapes by screws and is then mounted on a bottom chassis.

SUMMARY

An aspect of an exemplary embodiments provides a liquid crystal displaymodule which improves reliability when a printed circuit board isconnected to a bottom chassis, and a liquid crystal display devicehaving the same.

Additional aspects of the exemplary embodiments will be set forth inpart in the description which follows and, in part, will be obvious fromthe description, or may be learned by practice of the exemplaryembodiments.

An aspect of an exemplary embodiment provides a liquid crystal displaymodule including a bottom chassis including side surfaces and a lowersurface provided with at least one fastening hole, a printed circuitboard including one surface supported by the lower surface of the bottomchassis and a plurality of light emitting diodes mounted on the othersurface opposite to the surface and provided with at least one openinghole corresponding to the at least one fastening hole, at least onefastening member including a head part inserted into the at least oneopening hole so as not to be protruded outwardly from the other surfaceof the printed circuit board, and a screw part fastened into the atleast one fastening hole, and at least one support member including aboard support part supported by the other surface of the printed circuitboard at a position adjacent to the at least one opening hole so as tofix the printed circuit board to the bottom chassis, and a head supportpart extended from the board support part, interposed between the headpart of the at least one fastening member and the lower surface of thebottom chassis and provided with a through hole through which the screwpart passes.

The light emitting parts of the plurality of light emitting diodes maybe disposed to be vertical with respect to the other surface of theprinted circuit board so as to irradiate light in a direction parallelwith the lower surface of the bottom chassis.

The liquid crystal display module may further include a light guide unitto guide light emitted from the light emitting parts, and the at leastone opening hole may be disposed below the light guide unit.

The plurality of light emitting diodes may be disposed adjacent to theside surfaces of the bottom chassis.

The board support part and the head support part of the at least onesupport member may be formed such that there is a height differencetherebetween and a receipt part to receive the head part may be formedwithin the at least one support member.

A height of the receipt part may correspond to a thickness of theprinted circuit board.

The board support part may have a relatively large diameter, the headsupport part may have a relatively small diameter, and a connection partto form the inner wall of the receipt part may be formed in a taperedshape, a diameter of which is gradually decreased in a downwarddirection.

The at least one support member may be fixed to the printed circuitboard so as to be provided integrally with the printed circuit board.

The board support part may be soldered to the other surface of theprinted circuit board through a surface mount technology (SMT) process.

The at least one support member may be fixed to the at least onefastening member so as to be provided integrally with the at least onefastening member.

The liquid crystal display module may further include a connectorprotruded from the rear surface of the printed circuit board so as tosupply power to the plurality of light emitting diodes, and a connectorhole corresponding to the connector may be provided on the lower surfaceof the bottom chassis.

An aspect of another exemplary embodiment provides a liquid crystaldisplay device including a liquid crystal display panel, a light guideunit to guide light to the liquid crystal display panel, a bottomchassis including side surfaces and a lower surface supporting the lightguide unit and provided with at least one fastening hole, a printedcircuit board, on which a plurality of light emitting diodes is mounted,disposed below the light guide unit and provided with at least oneopening hole corresponding to the at least one fastening hole, at leastone fastening member including a head part inserted into the at leastone opening hole, and a screw part fastened into the at least onefastening hole, and at least one support member including a receipt partinserted into the at least one opening hole, a board support partextended outwardly from the upper end of the receipt part, and a headsupport part extended inwardly from the lower end of the receipt partand provided with a through hole through which the screw part passes,wherein the board support part applies pressure to an upper surface ofthe printed circuit board by the at least one fastening member to fixthe printed circuit board to the lower surface of the bottom chassis,and the head part is inserted into the receipt part so as not to beprotruded upwardly from the receipt part.

The at least one support member may be fixed to the printed circuitboard so as to be provided integrally with the printed circuit board.

The board support part may be soldered to the upper surface of theprinted circuit board through an SMT process.

The at least one support member may be fixed to the at least onefastening member so as to be provided integrally with the at least onefastening member.

The board support part may have a relatively large diameter, the headsupport part may have a relatively small diameter, and a connection partto form the inner wall of the receipt part may be formed in a taperedshape, a diameter of which is gradually decreased in a downwarddirection.

A height of the receipt part may correspond to a thickness of theprinted circuit board.

Light emitting planes of the plurality of light emitting diodes may bedisposed to be vertical with respect to the printed circuit board so asto irradiate light onto at least one side surface of the light guideunit.

The plurality of light emitting diodes may be disposed adjacent to theside surfaces of the bottom chassis.

The liquid crystal display device may further include a connectorprotruded from a rear surface of the printed circuit board so as tosupply power to the plurality of light emitting diodes, and a connectorhole corresponding to the connector may be provided on the lower surfaceof the bottom chassis.

The liquid crystal display device may further include a reflective unitdisposed on the lower end of the light guide unit, and the reflectiveunit may be disposed on the lower surface of the bottom chassis so as tocover the at least one opening hole.

An aspect of another exemplary embodiment provides a liquid crystaldisplay module including a bottom chassis including side surfaces and alower surface provided with at least one fastening hole, a printedcircuit board, on which a plurality of light emitting diodes is mounted,provided with at least one opening hole corresponding to the at leastone fastening hole, at least one fastening member including a head part,and a screw part fastened into the at least one fastening hole, and atleast one support member including a receipt part inserted into the atleast one opening hole to receive the head part, and a board supportpart supported by the printed circuit board, wherein the board supportpart applies pressure to the printed circuit board by fastening force ofthe at least one fastening member to fix the printed circuit board tothe lower surface of the bottom chassis.

An aspect of another exemplary embodiment provides a liquid crystaldisplay device including a liquid crystal display panel; a light guideunit which guides light to the liquid crystal display panel; a bottomchassis supporting the light guide unit and comprising a lower surfaceincluding at least one fastening hole disposed along a first direction;a printed circuit board comprising a first surface supported by thelower surface of the bottom chassis, a second surface opposite to thefirst surface, and at least one opening hole corresponding to the atleast one fastening hole of the bottom chassis; a plurality of lightemitting diodes mounted on the second surface of the printed circuitboard and positioned outside of the at least one fastening hole; and areflective unit disposed between the light guide unit and the printedcircuit board and overlapping the at least one opening hole.

The head part may not be protruded upwardly from the printed circuitboard when the at least fastening member is fastened into the at leastone fastening hole.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the exemplary embodiments will becomeapparent and more readily appreciated from the following description,taken in conjunction with the accompanying drawings of which:

FIG. 1 is an exploded perspective view schematically illustrating aliquid crystal display device in accordance with one exemplaryembodiment;

FIG. 2 is a cross-sectional view illustrating an assembly state of theliquid crystal display device in accordance with the exemplaryembodiment;

FIG. 3 is an exploded perspective view illustrating the connectionrelation between a bottom chassis and a light source unit in accordancewith the exemplary embodiment;

FIG. 4 is a cross-sectional view illustrating a connection state of thelight source unit to the bottom chassis in accordance with the exemplaryembodiment;

FIG. 5 is an exploded perspective view illustrating the connectionrelation between a bottom chassis and a light source unit in accordancewith another exemplary embodiment; and

FIG. 6 is an exploded perspective view illustrating the connectionrelation between a bottom chassis and a light source unit in accordancewith a further exemplary embodiment.

DETAILED DESCRIPTION

Reference will now be made in detail to the exemplary embodiments,examples of which are illustrated in the accompanying drawings, whereinlike reference numerals refer to like elements throughout. Expressionssuch as “at least one of,” when preceding a list of elements, modify theentire list and not the individual elements of the list.

FIG. 1 is an exploded perspective view schematically illustrating aliquid crystal display device in accordance with one exemplaryembodiment and FIG. 2 is a cross-sectional view illustrating an assemblystate of the liquid crystal display device in accordance with theexemplary embodiment.

As shown in FIGS. 1 and 2, the liquid crystal display device inaccordance with this exemplary embodiment includes a liquid crystaldisplay panel 10, a liquid crystal display module 20 located at the rearof the liquid crystal display panel 10, a middle mold 70 to support theliquid crystal display panel 10 and the liquid crystal display module 20such that the liquid crystal display panel 10 and the liquid crystaldisplay module 20 are separated from each other, and a top chassis 60and a bottom chassis 50 respectively disposed on the upper and lowersurfaces of the liquid crystal display panel 10 and the liquid crystaldisplay module 20.

The top chassis 60 includes a bezel part 61 surrounding the edge of theliquid crystal display panel 10 and a side part 63 bent from the end ofthe bezel part 61.

The bezel part 61 denotes a width from the outer line of the liquidcrystal display panel 10 to an active area in which an image isdisplayed.

The liquid crystal display panel 10 includes a thin film transistorsubstrate 11 on which thin film transistors are formed, a color filtersubstrate 13 facing the thin film transistor substrate 11, and a liquidcrystal layer (not shown) provided between the thin film transistorsubstrate 11 and the color filter substrate 13.

A drive unit 15 to apply a drive signal is provided at one side of thethin film transistor substrate 11.

The drive unit 15 includes flexible printed circuit boards (FPCBs) 16,drive chips 17 mounted on the FPCBs 16, and circuit boards 18 connectedto the FPCBs 16.

The drive unit 15 is formed in a chip on film (COF) type, but may beformed in other known types, such as a tape carrier package (TCP) typeand a chip on glass (COG) type. Further, the drive unit 15 may bemounted on the thin film transistor substrate 11.

The liquid crystal display panel 10 adjusts alignment of the liquidcrystal layer, thereby displaying an image. However, the liquid crystaldisplay panel 10 is a non-emissive element, and thus receives light fromthe liquid crystal display module 20 located on the rear surface of theliquid crystal display panel 10.

The liquid crystal display module 20 includes a plurality of opticalsheets 21 located under the liquid crystal display panel 10, a lightguide unit 25 located under the optical sheets 21, light source units 30to supply light to the light guide plate 25, and a reflective unit 40located on the lower surface of the light guide unit 25.

The optical sheets 21 include a protective film 22, prism films 23 and adiffusion film 24.

The diffusion film 24 is formed by applying a bead-shaped coating layerto a base film so as to diffuse light from the light guide unit 25 andthen to supply the diffused light to the liquid crystal display panel10.

Each of the prism films 23 is provided with trigonal prisms formed in adesignated alignment on the upper surface thereof so as to converge thelight diffused by the diffusion film 24 in a direction vertical to theflat surface of the upper liquid crystal display panel 10.

Two prism films 23 are generally used, and the micro prisms formed onthe respective prism films 23 form a designated angle.

Most of the light having passed through the prism films 23 progresses inthe vertical direction, thereby providing uniform brightnessdistribution.

The protective film 22 is located on the prism films 23 and serves toprotect the prism films 23 sensitive to scratches due to dust.

The light guide unit 25 is made of an acryl-based resin such aspolymethylmethacrylate (PMMA), or polymethyl styrene (PMS,methylmethacrylate-styrene copolymer), and serves to uniformly supplylight from the light source units 30 to the diffusion film 24.

The light guide unit 25 includes incident planes 26 provided on sidesurfaces of the light guide unit 25 such that light emitted from thelight source units 30 is incident upon the incident planes 26, a lightemitting plane 27 facing the diffusion film 24, and a reflective plane(not show) provided opposite to the light emitting plane 27.

The reflective unit 40 is located under the light guide unit 25 andserves to reflect light progressing downwards back to the light guideunit 25.

The reflective unit 40 may be made of a plastic material such aspolyethylene terephthalate (PET) or polycarbonate (PC).

Each of the light source units 30 includes a plurality of light emittingdiodes 31 to emit light, and a printed circuit board 33 on which theplurality of light emitting diodes 31 is mounted and a conductivepattern to apply electrical signals to the plurality of light emittingdiodes 31 is formed.

The plurality of light emitting diodes 31 may include a plurality ofwhite light emitting diodes to emit white light or a combination oflight emitting diodes to respectively emit red, green and blue light.

These light emitting diodes 31 are disposed to be vertical with respectto the surface of the printed circuit board 33 so as to irradiate lightonto the incident plane 26 of the light guide unit 25.

That is, light emitting planes 36 of the light emitting diodes 31 toemit light are disposed to be vertical with respect to the upper surfaceof the printed circuit board 33, and thus face the incident plane 26 ofthe light guide unit 25.

The printed circuit board 33 may be a metal printed circuit board (PCB)made of a material having high thermal conductivity, such as siliconsteel, galvanized steel and aluminum, or be a FPCB.

Each of the printed circuit boards 33 has a distance in the lengthwisedirection corresponding to a distance of the incident plane 26 of thelight guide unit 25 and a distance extended in the widthwise directionwhich is perpendicular to the lengthwise direction, i.e., an irradiationdirection of the light emitting diodes 31, thus being formed in arectangular shape having a designated thickness.

The printed circuit boards 33 serve to transmit light generated by thelight emitting diodes 31 to the outside as well as to supply drivesignals to the light emitting diodes 31.

For this purpose, rear surfaces 35 of the printed circuit boards 33 madeof a material having high thermal conductivity contact a lower surface51 of the bottom chassis 50 and thus rapidly transmit the heat generatedby the light emitting diodes 31 to the bottom chassis 50.

The bottom chassis 50 includes the lower surface 51 on which the liquidcrystal display module 20 is seated and side surfaces 52 extendedupwardly from the edge of the lower surface 51.

Such a bottom chassis 50 is made of a thermal conductive metal andtransmits heat generated by the light source units 30 to the outside.

That is, the rear surfaces 35 of the printed circuit boards 33 contactthe lower surface 51 of the bottom chassis 50, thereby improving a heatdissipation effect due to increase in a contact area.

Although not shown in the drawings, at least one of various circuitboards to drive the liquid crystal display device may be installed onthe rear surface of the bottom chassis 50. That is, when the liquidcrystal display device in accordance with the exemplary embodiment isapplied to a broadcast signal receiver (e.g., a TV), a power circuitboard and a main circuit board on which various necessary signalprocessing connectors and signal processing ICs are mounted may bescrew-connected to the rear surface of the bottom chassis 50. Further,the drive unit 15 of the liquid crystal display panel 10 may be fixed tothe edge of the rear surface of the bottom chassis 50.

Further, a connector 37 to supply power to the light emitting diodes 31is provided on the printed circuit board 33.

The connector 37 is electrically connected to a drive printed circuitboard (not shown) installed on the rear surface of the bottom chassis 50so as to apply drive power to the light emitting diodes 31. In thisexemplary embodiment, the connector 37 is protruded from the rearsurface 35 of the printed circuit board 33 and passes through aconnector hole 57 formed on the lower surface 51 of the bottom chassis50.

The connector 37 having passed through the connector hole 57 may beconnected to a connector provided at the end of a wire electricallyconnected to the drive board.

The light emitting diodes 31 are disposed at a position adjacent to theedge of one side of the printed circuit board 33. That is, the lightemitting diodes 31 are disposed at a position, which is offset from oreccentric to one side on an upper surface 34 of the printed circuitboard 33, and if the light source units 30 are installed on the bottomchassis 50, the light emitting diodes 31 are disposed adjacent to and tothe inside of the side surface 52 of the bottom chassis 50.

In this case, a part of the length W extended in the widthwise directionof the printed circuit board 33 is overlapped by the lower end of thereflective unit 40.

Through such a configuration, the width of the bezel part 61 of the topchassis 60 surrounding the edge of the liquid crystal display panel 10is greatly reduced, and thus immersion into a screen is enhanced and thescreen looks lager.

Although this exemplary embodiment illustrates four light source units30 disposed adjacent to four side surfaces of the light guide unit 25,two light source units 30 disposed adjacent to two opposite sidesurfaces of the light guide unit 25 or one light source unit 30 disposedadjacent to one side surface of the light guide unit 25 may be provided.

The printed circuit boards 33 of these light source units 30 may befixed to an inner part 51 a of the lower surface 51 of the bottomchassis 50 through fastening members 80, such as screws.

FIG. 3 is an exploded perspective view illustrating the connectionrelation between the bottom chassis and the light source unit inaccordance with the exemplary embodiment and FIG. 4 is a cross-sectionalview illustrating a connection state of the light source unit to thebottom chassis in accordance with the exemplary embodiment.

With reference to FIGS. 3 and 4, the printed circuit board 33 is seatedon the lower surface 51 of the bottom chassis 50 through the fasteningmembers 80 such that the light emitting diodes 31 of the light sourceunit 30 are disposed at a position adjacent to the side surface 52 ofthe bottom chassis 50.

A plurality of opening holes 38 is vertically formed through the printedcircuit board 33 so that a plurality of fastening members 80 isrespectively inserted into the plurality of opening holes 38, and aplurality of fastening holes 56 is provided on the lower surface 51 ofthe bottom chassis 50 at positions corresponding to the plurality ofopening holes 38 so that the plurality of fastening members 80 isrespectively fastened into the plurality of fastening holes 56.

Each of the plurality of fastening holes 56 is provided with a femalefastening part 56 a having a screw thread formed on the inner surfacethereof so as to have greater rigidity than the lower surface 51 tomaintain fastening force of the fastening member 80.

Each of the plurality fastening members 80 includes a head part 81inserted into the opening hole 38 and a male fastening part 82, or screwpart, fastened into the fastening hole 56, i.e., disposed in and affixedto the fastening hold 56.

The head part 81 may have a thickness t2 smaller than a thickness t1 ofthe printed circuit board 33 so as not to be protruded outwardly fromthe upper surface 34 of the printed circuit board 33 when the head part81 is inserted into the opening hole 38.

Further, the head part 81 may have a diameter D1 smaller than a diameterD2 of the opening hole 38 so as to be inserted into the opening hole 38.

These fastening members 80 fix the printed circuit board 33 to thebottom chassis 50 via support members 90.

Each of the support members 90 includes a board support part 91 having adiameter greater than the diameter D2 of the opening hole 38, and a headsupport part 92 having a height difference with the board support part91 and a diameter smaller than the diameter D2 of the opening hole 38.

The height difference between the board support part 91 and the headsupport part 92 may be equal to or slightly smaller than the thicknesst1 of the printed circuit board 33.

The board support part 91 and the head support part 92 areinterconnected by a connection part 93, and a receipt part 97 to receivethe head part 81 of the fastening member 80 is formed within the supportmember 90.

The receipt part 97 has a circular cross section. The receipt part 97may be formed in a cylindrical shape, a diameter of which is uniformthroughout upper and lower portions of the receipt part 97, or in atapered shape, a diameter of which is gradually decreased in a downwarddirection.

The board support part 91 is supported by the upper surface 34 of theprinted circuit board 33, and the head support part 92 is supported bythe lower surface 51 of the bottom chassis 50. Each of the board supportpart 91 and the head support part 92 has a circular cross section, butmay have any shape which may be supported by the printed circuit board33 and the lower surface 51 of the bottom chassis 50. Further, the boardsupport part 91 has a thin thickness and is flat so as not to interferewith structures mounted on the upper surface of the board support part91.

A through hole 95 through which the screw part 82 of the fasteningmember 80 passes is formed through the center of the head support part92.

Through such a configuration, the printed circuit boards 33 may be fixedto the bottom chassis 50 by the fastening members 80 via the supportmembers 90.

That is, when the screw parts 82 of the fastening members 80 areinserted and fastened into the through holes 95 and the fastening holes56 after the support members 90 are inserted into the opening holes 38of the printed circuit boards 33, the head support parts 92 areinterposed between the lower surface 51 of the bottom chassis 50 and thehead parts 81 of the fastening members 80 and the board support parts 91apply pressure to the upper surfaces 34 of the printed circuit boards33. Thereby, the printed circuit boards 33 are fixed under the conditionthat the rear surfaces 35 of the printed circuit boards 33 contact thelower surface 51 of the bottom chassis 50.

Here, since the head parts 81 of the fastening members 80 are receivedin the receipt parts 97 of the support members 90 and thus are notprotruded from the upper surfaces 34 of the printed circuit boards 33,generation of damage to the light guide unit or the optical sheetsseated on the upper surfaces 34 of the printed circuit boards 33 inaccordance with this exemplary embodiment due to pressure of the headparts 81 may be prevented.

Although this exemplary embodiment illustrates the support members 90and the fastening members 80 as being separately provided so as to fixthe printed circuit boards 33 to the lower surface 51 of the bottomchassis 50, the support members 90 may be provided integrally with theprinted circuit boards 33, as shown in FIG. 5, or may be providedintegrally with the fastening members 80, as shown in FIG. 6, so as toreduce manual labor to facilitate workability.

If the support members 90 are formed integrally with the printed circuitboard 33, land parts 39 to fix the support members 90 are provided onthe upper surface 34 of the printed circuit board 33 at positionsadjacent to the opening holes 38, thereby allowing the support members90 to be soldered to the printed circuit boards 33 through a surfacemount technology (SMT) process.

As is apparent from the above description, a liquid crystal displaymodule and a liquid crystal display device having the same in accordancewith exemplary embodiments improve reliability.

Although a few exemplary embodiments have been shown and described, itwould be appreciated by those skilled in the art that changes may bemade in these exemplary embodiments without departing from theprinciples and spirit of the inventive concept, the scope of which isdefined in the claims and their equivalents.

What is claimed is:
 1. A liquid crystal display module comprising: abottom chassis comprising a lower surface including at least onefastening hole disposed along a first direction; a printed circuit boardcomprising a first surface supported by the lower surface of the bottomchassis, a second surface opposite to the first surface, and at leastone opening hole corresponding to the at least one fastening hole of thebottom chassis; a plurality of light emitting diodes mounted on thesecond surface of the printed circuit board; and at least one fasteningmember comprising a head part inserted into the at least one openinghole of the printed circuit board so as not to be protruded outwardlyfrom the second surface of the printed circuit board, and a fasteningpart disposed in and affixed to the at least one fastening hole.
 2. Theliquid crystal display module according to claim 1, further comprising:at least one support member comprising a board support part supported bythe second surface of the printed circuit board at a position adjacentto the at least one opening hole, and a head support part extended fromthe board support part, the head support part interposed between thehead part of the at least one fastening member and the lower surface ofthe bottom chassis, the at least one support member comprising at leastone through hole through which the fastening part passes, wherein theboard support part applies pressure to the second surface of the printedcircuit board by the at least one fastening member to fix the printedcircuit board to the lower surface of the bottom chassis.
 3. The liquidcrystal display module according to claim 1, wherein the plurality oflight emitting diodes comprise a plurality of light emitting planesdisposed vertically with respect to the second surface of the printedcircuit board and which irradiate light in a second directionperpendicular to the first direction and parallel to the lower surfaceof the bottom chassis.
 4. The liquid crystal display module according toclaim 3, further comprising a light guide unit to guide light emittedfrom the light emitting parts, wherein the at least one opening hole isdisposed below the light guide unit.
 5. The liquid crystal displaymodule according to claim 4, wherein the bottom chassis comprises aplurality of side surfaces and the plurality of light emitting diodes isdisposed adjacent to the side surfaces of the bottom chassis.
 6. Theliquid crystal display module according to claim 2, wherein the boardsupport part and the head support part of the at least one supportmember are spaced from one another in the first direction and a receiptpart to receive the head part is formed within the at least one supportmember.
 7. The liquid crystal display module according to claim 6,wherein a height of the receipt part corresponds to a thickness of theprinted circuit board.
 8. The liquid crystal display module according toclaim 6, wherein the board support part has a first diameter, the headsupport part has a second diameter smaller than the first diameter, anda connection part to form the inner wall of the receipt part is formedin a tapered shape, wherein a diameter of the connection part isdecreased in a downward direction along the first direction.
 9. Theliquid crystal display module according to claim 2, wherein the at leastone support member is fixed to the printed circuit board so as to beintegral with the printed circuit board.
 10. The liquid crystal displaymodule according to claim 9, wherein the board support part is solderedto the second surface of the printed circuit board.
 11. The liquidcrystal display module according to claim 2, wherein the at least onesupport member is fixed to the at least one fastening member so as to beintegral with the at least one fastening member.
 12. The liquid crystaldisplay module according to claim 1, further comprising a connectorprotruded from the first surface of the printed circuit board to supplypower to the plurality of light emitting diodes, wherein a connectorhole corresponding to the connector is formed on the lower surface ofthe bottom chassis.
 13. A liquid crystal display device comprising: aliquid crystal display panel; a light guide unit which guides light tothe liquid crystal display panel; a bottom chassis comprising a lowersurface supporting the light guide unit and comprising at least onefastening hole disposed along a first direction; a printed circuit boardcomprising a first surface supported by the lower surface of the bottomchassis, a second surface opposite to the first surface, and at leastone opening hole corresponding to the at least one fastening hole theprinted circuit board disposed between the light guide unit and thebottom chassis; a plurality of light emitting diodes mounted on theprinted circuit board; and at least one fastening member comprising ahead part inserted into the at least one opening hole of the printedcircuit board so as to not protrude outwardly from the second surface ofthe printed circuit board, and a fastening part disposed in and affixedto the at least one fastening hole.
 14. The liquid crystal displaydevice according to claim 13, further comprising: at least one supportmember comprising a receipt part inserted into the at least one openinghole, a board support part extended outwardly from an upper end of thereceipt part, and a head support part extended inwardly from a lower endof the receipt part, the at least one support member comprising at leastone through hole through which the fastening part passes, wherein theboard support part applies pressure to the second surface of the printedcircuit board by the at least one fastening member to fix the printedcircuit board to the lower surface of the bottom chassis.
 15. The liquidcrystal display device according to claim 14, wherein the at least onesupport member is fixed to the printed circuit board so as to beintegral with the printed circuit board.
 16. The liquid crystal displaydevice according to claim 14, wherein the board support part is solderedto the second surface of the printed circuit board.
 17. The liquidcrystal display device according to claim 14, wherein the at least onesupport member is fixed to the at least one fastening member so as to beintegral with the at least one fastening member.
 18. The liquid crystaldisplay device according to claim 14, wherein the board support part hasa first diameter, the head support part has a second diameter smallerthan the first diameter, and a connection part to form the inner wall ofthe receipt part is formed in a tapered shape, wherein a diameter of theconnection part is decreased in a downward direction along the firstdirection.
 19. The liquid crystal display device according to claim 13,wherein a height of the receipt part corresponds to a thickness of theprinted circuit board.
 20. The liquid crystal display device accordingto claim 13, wherein the plurality of light emitting diodes comprise aplurality of light emitting planes disposed vertically with respect tothe second surface of the printed circuit board and which irradiatelight onto at least one side surface of the light guide unit.
 21. Theliquid crystal display device according to claim 20, wherein the bottomchassis comprises a plurality of side surfaces and the plurality oflight emitting diodes is disposed adjacent to the side surfaces of thebottom chassis.
 22. The liquid crystal display device according to claim13, further comprising a connector protruded from the first surface ofthe printed circuit board to supply power to the plurality of lightemitting diodes, wherein a connector hole corresponding to the connectoris formed on the lower surface of the bottom chassis.
 23. The liquidcrystal display device according to claim 13, further comprising areflective unit disposed on the lower end of the light guide unit,wherein the reflective unit is disposed on the lower surface of thebottom chassis and covers the at least one opening hole.
 24. A liquidcrystal display module comprising: a bottom chassis comprising a lowersurface including at least one fastening hole disposed along a firstdirection; a printed circuit board comprising a first surface supportedby the lower surface of the bottom chassis, a second surface opposite tothe first surface, and at least one opening hole corresponding to the atleast one fastening hole; a plurality of light emitting diodes mountedon the second surface of the printed circuit board; at least onefastening member comprising a head part inserted into the at least oneopening hole of the printed circuit board, and a fastening part disposedin and affixed to the at least one fastening hole.
 25. The liquidcrystal display module according to claim 24, further comprising: atleast one support member comprising a receipt part inserted into the atleast one opening hole to receive the head part, and a board supportpart supported by the second surface of the printed circuit board,wherein the board support part applies pressure to the printed circuitboard by fastening force of the at least one fastening member to fix theprinted circuit board to the lower surface of the bottom chassis. 26.The liquid crystal display module according to claim 25, wherein thehead part is not protruded upwardly from the printed circuit board whenthe at least fastening member is disposed in the at least one fasteninghole.
 27. A liquid crystal display device comprising: a liquid crystaldisplay panel; a light guide unit which guides light to the liquidcrystal display panel; a bottom chassis supporting the light guide unitand comprising a lower surface including at least one fastening holedisposed along a first direction; a printed circuit board comprising afirst surface supported by the lower surface of the bottom chassis, asecond surface opposite to the first surface, and at least one openinghole corresponding to the at least one fastening hole of the bottomchassis; a plurality of light emitting diodes mounted on the secondsurface of the printed circuit board and positioned outside of the atleast one fastening hole; and a reflective unit disposed between thelight guide unit and the printed circuit board and overlapping the atleast one opening hole.
 28. The liquid crystal display device of claim27, further comprising: at least one fastening member comprising a headpart inserted into the at least one opening hole of the printed circuitboard so as not to be protruded outwardly from the second surface of theprinted circuit board, and a fastening part disposed in and affixed tothe at least one fastening hole; and at least one support membercomprising a board support part supported by the second surface of theprinted circuit board at a position adjacent to the at least one openinghole, and a head support part extended from the board support part, thehead support part interposed between the head part of the at least onefastening member and the lower surface of the bottom chassis, the atleast one support member comprising at least one through hole throughwhich the fastening part passes.